<template>
  <view class="search-box">
    <!-- 使用 uni-ui 提供的搜索组件 -->
    <uni-search-bar @input="input" :radius="100" cancelButton="none" :show="true" :showSync="true"></uni-search-bar>
    <!-- 搜索建议列表 -->
    <view class="sugg-list" v-if="searchList.length != 0">
      <view class="sugg-item" v-for="(item, i) in searchList" :key="i" @click="gotoDetail(item.goods_id)">
        <view class="goods-name">{{item.goods_name}}</view>
        <uni-icons type="arrowright" size="16"></uni-icons>
      </view>
    </view>
    <!-- 搜索历史 -->
    <view class="history-box" v-else>
      <!-- 标题区域 -->
      <view class="history-title">
        <text>搜索历史</text>
        <uni-icons type="trash" size="17" @click="cleanHistory"></uni-icons>
      </view>
      <!-- 列表区域 -->
      <view class="history-list">
        <uni-tag :text="item" v-for="(item, i) in historyListes" :key="i" @click="gotoGoodsList(item)"></uni-tag>
      </view>
    </view>
  </view>
</template>

<script>
export default {
  data(){
    return {
      // show: true,
      // showSync: true,
      // 延时器的 timerId
      timer: null,
      // 搜索关键词
      kw: '',
      searchList:[],
      // 搜索关键词的历史记录
      historyList: []
    }
  },
  onLoad() {
    this.historyList = JSON.parse(uni.getStorageSync('kw') || '[]')
  },
  methods: {
    input(e) {
      clearTimeout(this.timer)
      this.timer = setTimeout(()=>{
        this.kw = e
        this.getSearchList()
      },500)
    },
    async getSearchList(){
      if(this.kw.length === 0){
        this.searchList = []
        return
      }
      let res = await uni.$http.get('/api/public/v1/goods/qsearch', { query: this.kw })
      console.log(res);
      if(res.statusCode == 200){
        this.searchList = res.data.message
      }else {
        return uni.$showMsg('查询有误！');
      }
       this.saveSearchHistory()
    },
    gotoDetail(id){
      uni.navigateTo({
        url: '/subpkg/goods_detail/index?goods_id=' + id
      })
    },
    saveSearchHistory(){
      // 2.1 直接把搜索关键词 push 到 historyList 数组中
      const i = this.historyList.indexOf(this.kw)
      if(i == -1){
        this.historyList.push(this.kw)
      }else {
        this.historyList
      }
      // 调用 uni.setStorageSync(key, value) 将搜索历史记录持久化存储到本地
      uni.setStorageSync('kw', JSON.stringify(this.historyList))
    },
    cleanHistory(){
      this.historyList = []
      // 清空本地存储中记录的搜索历史
      uni.setStorageSync('kw', '[]')
    },
    // 点击跳转到商品列表页面
    gotoGoodsList(kw) {
      uni.navigateTo({
        url: '/subpkg/goods_list/index?query=' + kw
      })
    }
  },
  computed:{
    historyListes(){
      return [...this.historyList].reverse()
    }
  }
}
</script>

<style>
.uni-searchbar {
  /* #ifndef APP-NVUE */
  display: flex;
  /* #endif */
  flex-direction: row;
  position: relative;
  padding: 16rpx;
  /* 将默认的 #FFFFFF 改为 #C00000 */
  background-color: #1296db;
}
.search-box {
  position: sticky;
  top: 0;
  z-index: 999;
}
.sugg-list {
  padding: 0 5px;
}
.sugg-item {
  font-size: 12px;
  padding: 13px 0;
  border-bottom: 1px solid #efefef;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.goods-name {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  margin-right: 3px;
}
.history-box {
  padding: 0 5px;
}
.history-box .history-title {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 40px;
  font-size: 13px;
  border-bottom: 1px solid #efefef;
}
.history-list {
  display: flex;
  flex-wrap: wrap;
}
.uni-tag {
  margin-top: 5px;
  margin-right: 5px;
}
</style>